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Both G.726 and IMA/DVI ADPCM Frames shall be 100 octets in length; consisting of 96 octets of encoded audio sample data and 4 octets of metadata. 
Figure 5 shows the layout of an audio frame and the how it is sent in 20 octet GATT notifications. 

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diagramNameAudioFrameAndGateNotification
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Gliffy Diagram
macroIdcd71afb8-fe17-46d5-997a-33fb8b2d06a2
nameAudio-Data-Characteristic
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The 4 octet meta data header contains information to be used by the decoder, Table below shows the format of the meta data. 

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